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A certified HVAC contractor performs a Manual J load calculation for exact sizing.
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| Home Size | Recommended Tons | BTU/hr | FL Climate Note |
|---|---|---|---|
| Under 1,000 sq ft | 1.5 tons | 18,000 BTU | Good for condos/studios |
| 1,000 – 1,400 sq ft | 2 tons | 24,000 BTU | South FL may need 2.5 tons |
| 1,400 – 1,800 sq ft | 2.5 tons | 30,000 BTU | Standard for most FL homes |
| 1,800 – 2,200 sq ft | 3 tons | 36,000 BTU | Most common FL size |
| 2,200 – 2,800 sq ft | 3.5 tons | 42,000 BTU | High ceilings may need 4 tons |
| 2,800 – 3,600 sq ft | 4 tons | 48,000 BTU | Coastal: verify with Manual J |
| 3,600 – 4,500 sq ft | 4.5 – 5 tons | 54–60,000 BTU | May need dual systems |
| 4,500 sq ft + | 5+ tons | 60,000+ BTU | Dual-zone system recommended |
For most Florida homes around 2,000 sq ft, a 3 to 3.5 ton AC is the typical recommendation — but this depends heavily on your location, ceiling height, insulation, and sun exposure. South Florida homes may need 3.5–4 tons for the same square footage due to higher temperatures and humidity year-round.
Manual J is the ACCA (Air Conditioning Contractors of America) standard for calculating the exact heating and cooling load of a home. In Florida, a licensed contractor is required by code to perform a Manual J before sizing a new system. Any contractor who simply matches your old unit's size without a Manual J is cutting corners.
Signs your AC may be wrong-sized: oversized — system cycles on and off quickly (every 5–10 minutes), home feels clammy/humid even when cool, some rooms are cold while others are warm. Undersized — system runs constantly without reaching setpoint, extremely high electricity bills, system struggles on days above 90°F.
Neither — both cause serious problems in Florida. An oversized AC short-cycles, leaving humidity in the air and increasing mold risk. An undersized AC runs constantly and still can't cool your home on the hottest days. The correct size — determined by a Manual J calculation — is the only right answer.
Florida's combination of high temperatures (90°F+ for 6–8 months), extreme humidity (75–85% RH), intense solar radiation, and minimal overnight cooling means your AC works far harder than in northern states. A home that needs 3 tons in Chicago might need 3.5–4 tons in Miami for equivalent comfort.
Yes — significantly. Florida attics can reach 140°F+ in summer, and poorly insulated or leaky ducts lose a substantial portion of your AC's cooling before it reaches living spaces. A properly sized AC can be made ineffective by an undersized or leaky duct system. Duct inspection is part of a proper Manual J assessment.
